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иван676
@иван676
July 2022
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1) 3(1-2х)-5(3-х)-6(3х-4)=83
2)[tex]2 x^{2} -x+1=0[/tex]
3-е уравнение на фото
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ShirokovP
Verified answer
1)
3 - 6x - 15 + 5x - 18x + 24 = 83
- 19x + 12 = 83
- 19x = 71
x = - 71/19 = - 3 целых 14/19
2)
2x^2 - x + 1 = 0
D = 1 - 4*2 < 0
Корней на множестве действительных чисел нет
3)
Умножим обе части на 20
4(x - 2) + 5(2x - 5) + 4x + 1 = 20(4 - x)
4x - 8 + 10x - 25 + 4x + 1 = 80 - 20x
18x - 32 = - 20x + 80
18x + 20x = 80 + 32
38x = 112
x = 112/38 = 56/19 = 2 целых 18/19
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Answers & Comments
Verified answer
1)3 - 6x - 15 + 5x - 18x + 24 = 83
- 19x + 12 = 83
- 19x = 71
x = - 71/19 = - 3 целых 14/19
2)
2x^2 - x + 1 = 0
D = 1 - 4*2 < 0
Корней на множестве действительных чисел нет
3)
Умножим обе части на 20
4(x - 2) + 5(2x - 5) + 4x + 1 = 20(4 - x)
4x - 8 + 10x - 25 + 4x + 1 = 80 - 20x
18x - 32 = - 20x + 80
18x + 20x = 80 + 32
38x = 112
x = 112/38 = 56/19 = 2 целых 18/19